static classes for database access?

Question

I am using DataClassesDataContext to map all the tables from the db into my asp.net application.

For doing CRUD operations i have made static classes with methods, and inside every method a instantiate DataClassesDataContext.

For instance:

public static class UserQ
{
    public static User getUserById(int userId)
    {
        DataClassesDataContext db = new DataClassesDataContext();
        var requestedUser = (from u in db.Users
                             where u.User_id == userId
                             select u).First();
        if (requestedUser != null)
            return (User)requestedUser;
        else
            return null;
    }
}

I aam not sure if this way of doing database operations in a web application is safe? If not, can you suggest please a better pattern?

score 2 · Answer 1 · answered Feb 08 '10 at 18:32

2

As DataClassesDataContext implements IDisposable, you should be wrapping it with a using directive:

using (DataClassesDataContext db = new DataClassesDataContext())
{
...
}

answered Feb 08 '10 at 18:32

Oded

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score 1 · Accepted Answer · edited Mar 21 '23 at 15:06

1

I would suggest taking a look at the Repository Pattern:

Example 1
Example 2 (Scott Gu's first chapter from Nerd Dinner - its for MVC but the Repository pattern illustrated works w/o MVC)

edited Mar 21 '23 at 15:06

Glorfindel

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answered Feb 08 '10 at 18:28

Ta01

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I agree. It really will simplify things and in the case of LINQ to SQL it will increase your performance greatly if you rely on IQueryable. Take a look here http://stackoverflow.com/questions/1223194/loading-subrecords-in-the-repository-pattern – Keith Adler Feb 08 '10 at 18:32
Thanks. Haven't heard about Repository Pattern before. After rading the articles i can say: Great! – Cristian Boariu Feb 08 '10 at 19:12

score 1 · Answer 3 · answered Feb 09 '10 at 01:30

I would be very very careful about using STATIC in web applications. Sometimes the bugs are so subtle that you will spend a lot of time debugging.

I think bnkdev & Oded hit the nail on the head: look at repository pattern & wrap your context call in a using statement...

HTH.

static classes for database access?

3 Answers3